If those planning to attend had some hand-out descriptive material for the non-FRC that might happen to be there, it would increase awareness even more. Just a few short sentences about what's going on would help explain your enthusiasm. The concept of the four divisions under the same roof, more or less simultaneously is the first thing I'd mention. Summarize Breakaway rules in 4 or five lines and have a complete copy of the rules in case you get a chance to evangelize.
Any hand-outs left over from regional(s)? bring 'em. In short, pretend you're in the dome.